Increased levels of metabolic waste products and decreased oxygen concentration in tissues promote increased blood flow through the tissues.

Applying cold to a tissue causes arterioles in that tissue to dilate so as to increase the blood flow and warm the tissue back up.

If blood flow to a tissue is blocked for a period of time and then the block is removed, the result is a reactive hyperemia in which blood flow through the affected tissue remains low.

If the arterial blood pressure to an organ suddenly decreases, arterioles in the organ will constrict in response to ensure that blood flow to the organ is not affected.